The Kappa Mortis Incident was a brief Imperial military campaign in which a detachment from the Ultramarines Space Marine Chapter sought to recover a downed Imperial shuttlecraft containing captured Tau technology. As the Imperium had only recently encountered this new and unusually technologically advanced xenos species, the Inquisitors of the Ordo Xenos and the Magi of the Adeptus Mechanicus were eager to get their Mechadendrites on Tau wargear so that they could plumb the depths of its heretical secrets and fashion appropriate Imperial countermeasures. The recovery mission proved successful, though the Ultramarines recovered only a single helmet taken from a Tau XV15 Stealthsuit. However, the Tau feared that this in itself would prove detrimental to the Fire Caste's tactical surprise ov